<template>
  <div>
    <span>全选:</span>
    <input type="checkbox" v-model="isChecked" />
    <button @click="isChecked=!isChecked">反选</button>
    <ul>
      <li v-for="item in arr" :key="item.name">
        <input type="checkbox" v-model="item.checked"/>
        <span>{{item.name}}</span>
      </li>
    </ul>
  </div>
</template>
<script>
export default {
  data() {
    return {
      arr: [
        {
          name: "猪八戒",
          checked: true,
        },
        {
          name: "孙悟空",
          checked: false,
        },
        {
          name: "唐僧",
          checked: true,
        },
        {
          name: "白龙马",
          checked: false,
        },
      ],
    };
  },
 computed:{
   isChecked:{
    set(val){
    return  this.arr.forEach(item => item.checked=val);
   },
   get(){
    return this.arr.every(item=>item.checked)
   }
   }
  
 }
  
};
</script>

<style>
</style>